4031311221 has 64 divisors (see below), whose sum is σ = 6922137600. Its totient is φ = 2271250368.

The previous prime is 4031311217. The next prime is 4031311237. The reversal of 4031311221 is 1221131304.

It is not a de Polignac number, because 4031311221 - 2² = 4031311217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4031311194 and 4031311203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4031311211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4544440 + ... + 4545326.

It is an arithmetic number, because the mean of its divisors is an integer number (108158400).

Almost surely, 2^4031311221 is an apocalyptic number.

It is an amenable number.

4031311221 is a deficient number, since it is larger than the sum of its proper divisors (2890826379).

4031311221 is a wasteful number, since it uses less digits than its factorization.

4031311221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215 (or 1209 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 4031311221 is about 63492.6076090752. The cubic root of 4031311221 is about 1591.5322466797.

Adding to 4031311221 its reverse (1221131304), we get a palindrome (5252442525).

The spelling of 4031311221 in words is "four billion, thirty-one million, three hundred eleven thousand, two hundred twenty-one".